code: def emit_preamble_codes(self):
      preamble = self.preamble
      return [preamble] if preamble != "" else []
  
imports: import string
  import numpy
  from cupy._core import _codeblock
  from cupy._core._fusion_variable import _TraceVariable
  from cupy._core._fusion_variable import _TraceArray
  from cupy._core._fusion_variable import _VariableSet
  from cupy._core import _fusion_thread_local
  from cupy._core import _kernel
  from cupy._core import _reduction
  from cupy._core._scalar import get_typename
label_desc: Use image node_id 4 for calling the _ReductionTraceOp obj's underlying member method code with example usage: obj.emit_preamble_codes() and returns: unknown